Establishment of new facilities for WWVL and WWVB

Richardson, J.

doi:10.6028/jres.068d.026

Cited by 3 publications

(4 citation statements)

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“…The south antenna array would be used for the WWVB broadcast, and the north array for WWVL [ 7 , 38 ]. The radiated efficiency of the antennas was estimated as 2.2 % at 20 kHz, and 24.6 % at 60 kHz [ 39 ]. An artist’s depiction of the two antennas made during the early days of their operation is shown in Fig.…”

Section: The Original Station Design and The First Broadcasts Frommentioning

confidence: 99%

WWVB

Lombardi

Nelson

2014

J. RES. NATL. INST. STAN.

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In commemoration of its 50th anniversary of broadcasting from Fort Collins, Colorado, this paper provides a history of the National Institute of Standards and Technology (NIST) radio station WWVB. The narrative describes the evolution of the station, from its origins as a source of standard frequency, to its current role as the source of time-of-day synchronization for many millions of radio controlled clocks.

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Section: The Original Station Design and The First Broadcasts Frommentioning

confidence: 99%

WWVB

Lombardi

Nelson

2014

J. RES. NATL. INST. STAN.

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“…The HF broadcasts of WWV are at 2. 5, 5, 10, 15, 20, and 25 Mc/s while those at WWVH are at 5, 10, and 15 Mc/s; characteristics of the NBS radio stations have been given previously [Morgan, 1962 andRichardson, 1964].…”

Section: Nbs Standard Frequency Broadcastsmentioning

confidence: 99%

“…Great Britain, however, has pioneered in broadcasting standard frequency signals in both VLF and LF bands . The Sunset station operated for nearly 31f2 years, and was relocated with modified equipment at Fort Collins, Colo., August 1963[NBS, 1963Richardson, 1964]. This new station (WWVL-latitude 40°40'51" Nlongitude 105°03'00" W) provided a much larger antenna and more powerful transmitter; thus, the radiated power was increased from 15 W to about 1 kW.…”

mentioning

confidence: 99%

Control of WWV and WWVH standard frequency broadcasts by VLF and LF signals

Blair¹,

Morgan²

1965

J. RES. NATL. BUR. STAN. SECT. D. RAD. SCI.

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Since 1961 the NBS VLF and LF signals have improved the calibration and frequency control of th e WWV (Mary land) HF broadcasts. Similarly, better co ntrol of the WWVH (Hawai i) HF broadcasls was achieved in early 1963 by monitoring the NBS VLF broadcasts in terms of the WWVH control oscillator. In mid 1963 WWVL (20 kc/s) and WWVB (60 kc/s) were relocated from two sites near Boulder, Colo., to a single site near Ft. Collins, Colo., and the transmitter power for both broadcasts was increased several fold. These higher powered broadcasts resulted in more precise co ntrol of both HF broadcasts. Through the VLF and LF signals the 24-hr average frequency values ofW WV are related to the United States Frequency Standard (USFS) within a few parts in 10". This paper describes the NBS low-frequency broadcasts, the method of using them to co ntrol and calibrate the HF broadcasts, and gives an analysis of the precision of frequency co ntrol obtained at WWV over a 21-month period. An appendix discusses the short-term phase stabilities and diurnal phase shifts observed in the low-frequency signals at WWV and WWVH, and examines the accuracy· limiting effects of propagation path characteristics and background noise levels in suc h received signals.

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“…One improvement envisioned for VLF phase comparison measurements is the use of the higher-power WWVL (20 kc/s) transmissions (l to 2 kW radiated power) which comme nced from the new NBS Fort Collins Standard Radio Transmitting Site in August 1963 [Richardson, 1964;Blair and Morgan, 1965].…”

Section: Possible Future Improvements In Vlf Measurementsmentioning

confidence: 99%

International comparison of atomic frequency standards via VLF radio signals

Morgan¹,

Crow²,

Blair³

1965

J. RES. NATL. BUR. STAN. SECT. D. RAD. SCI.

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A study was mad e of data obtained over an 18·month period (July 1961to December 1962 on th e co mpari so n of atomic frequency s tandard s located in se ve n laboratories in the Un ited States, Europe, and Ca nada, using th e VLF signals of eBR (16 kc/s), Rugby, England, and NBA (18kc/s), Balboa, Canal Zone. Eac h laboratory observes th e accu mulated diffe ren ce in phase over a 24-hr period (the sa me for a ll laboratories, or nea rly so) be twee n its own sta ndard (e ith e r laboratory or commerciaUy co ns tru cted) and the receive d VLF signal. A stati sti cal analysis was des igned to se parate the obse rvation s at eac h laboratory into three components: (a) lon g-term mean diffe rences a mong the atomic standard s; (b) es timates or the standard deviations , a;, at eac h receiving stati o n; and (c) es timates of the tran s mitt e r standard deviations, 7. Each a; inc lud es rece iver flu ctuations, propaga tion effects pe rc uliar to th e pat h, and meas ure me nt unce rtainties; T in clud es the tran smitter flu c tuation s and propagation effects co mmon to all pat hs.Th e study shows that aLat each .receiver varied from a low of 0.39 X 10-1 0. units of fractional frequency (that is, 0.39 parts in 10 10 ) (GBR data) at LSRH to a high of 1.97 X 10-10 (GBR data) at NRC with an average for all s tations of 1.01 X 10-10 meas ured against eBR and 0.99 X 10-10 when meas ured against NBA. Also, the average T for eBR is 1.26 X 10-10 and for NBA is 0.68 X 10-10 • Fi na ll y, it is shown that: (1) the mea ns of the frequ e nc ie s of th e seven individual laboratories agreed with the grand mean of these seven laboratories to within ± 2 parts in 10 10 for the 18-month period , and (2) the laboratory-type standards agreed with th eir grand mean to within ± 1 part in 10 10

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Establishment of new facilities for WWVL and WWVB

Cited by 3 publications

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WWVB

WWVB

Control of WWV and WWVH standard frequency broadcasts by VLF and LF signals

International comparison of atomic frequency standards via VLF radio signals

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